Abstract
A laser rangefinder is a device that uses laser light to determine the distance of an object. The working principle of this laser rangefinder is that the laser beam that is emitted to the object will be reflected back to the rangefinder, and the required propagation time of laser beam will be calculated to get the distance value. In this study, a laser rangefinder system was designed to be used as monitoring of obstacle height between the line of sight of a microwave communication link using a quadcopter, which is used as a top-viewer picture taker. The quadcopter was used as a device to carry the laser rangefinder to measure the obstacle height between the location points of near-end and far-end. The obstacle height reading results were transmitted using a 5.8 GHz wireless transceiver to the monitoring location in real time. The data received were then processed to be displayed in the form of obstacle height graph as a function of the line of sight communication distance. The test results show that the implementation of laser rangefinder technology has an accuracy of more than 90%. Keywords : Line of Sight, Laser Rangefinder, Near-end and far-end, Quadcopter, Obstacle
Highlights
Introduction to Autonomous Mobile RobotsMassachusetts Institute of Technology, ISBN-[10]
The steps in designing the obstacle height monitoring system in microwave communication path were: 1. Collecting data on microwave radio transmission survey requirements related to determining the antenna height of the transmitterand the receiver and the height of an obstacle that was expected to interfere the line of sight communication system as a reference for the system design
The study result was a tool for surveying the line of sight microwave radio transmission, which is mainly used to determine the height of an obstacle in the communication path
Summary
2. Data Transmission Devices The resulting obstacle height data were transmitted through a wireless transceiver, which were received at the monitoring location to be processed and displayed in real time. 1. Obstacle Height Measuring System The laser rangefinder height sensor was controlled by a microcontroller (Arduino Uno R3), the generated height data were fed to the FSK modem to be transmitted to the monitoring location via the wireless AV Transceiver. The calibration result shows that in 260 measurements of an object located in a distance of 220 m, the average difference between the measured and the real distancewas 3.5 m This means that the error of the laser rangefinder device was 1.59% or it had an accuracy of 98%.
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